CN105419599B - A kind of high solid aliphatic acrylic polyurethane coating and preparation method - Google Patents

Abstract

The invention discloses a high-solid aliphatic acrylic polyurethane coating and a preparation method thereof, which comprises packaging component A, component B and component C separately. Component A: 1) Preparation of 20% polyamide wax slurry additive; 2) Preparation of grinding color paste: high solid and low viscosity hydroxyl acrylic resin, wetting agent, dispersant, ethyl triethoxy propionate, titanium White powder, spherical glass beads, carbon black, 154L yellow, bentonite, xylene: 3) Paint adjustment: UV absorber, 20% polyamide wax slurry additive, leveling agent, defoamer, butyl acetate Get component A. Component B: The aliphatic isocyanate trimer is the B component. Component C: Mix butyl acetate, PMA, and S-100 evenly to obtain component C. The invention is environmentally friendly, saves energy, greatly reduces the discharge of toxic and harmful gases, thereby realizing energy saving and consumption reduction; the coating cycle is short and the efficiency is high. The dry film thickness of one-time coating is high, the number of coating coats is reduced, the coating efficiency is improved, the labor intensity is reduced, and the impact resistance of the coating film is strong.

Description

A kind of high solid content aliphatic acrylic polyurethane coating and preparation method thereof

technical field

The invention relates to the technical field of organic polymer synthetic materials, in particular to a high-solid aliphatic acrylic polyurethane coating suitable for steel structures and concrete protection in various atmospheric environments and a preparation method thereof.

Background technique

The emission of volatile organic compounds (VOC) in coatings is the main source of environmental pollution from coatings. According to statistics, millions of tons of solvents are discharged from coatings into the atmosphere every year around the world. These VOCs not only destroy the environment that human beings rely on for survival Atmospheric ecological environment, but also cause harm to human health. Environmentally friendly coatings have become one of the key development directions of the industry, which mainly include high-solid coatings, water-based coatings, powder coatings, UV coatings, etc., and high-solid coatings are among the varieties with the most development potential. The amount of solvent used in the production process is greatly reduced, and no special production process equipment is required, which reduces the pollution in the production process of coating enterprises and also reduces the production cost. High solid aliphatic acrylic polyurethane coating consumes very little energy during curing, and can be cured at room temperature or low temperature to form a film. Comprehensive environmental protection and coating performance, the use of high solid content coatings at this stage has unique advantages. As a high-solid acrylic polyurethane coating, it not only has excellent coating performance, but also can meet environmental protection requirements and develop into a low-pollution coating variety, so it has a wide range of coating application markets and good development prospects. It is generally stipulated that the construction solid content is 61-95% as high solid content coating. In recent years, there are many patents and documents about the development and application of high-solid acrylic polyurethane coatings, such as CN103396729A disclosing a low-viscosity high-solid acrylic polyurethane coating and its preparation method, Hui Xuezhou's master's thesis "High-solid acrylic polyurethane "Development of Coatings" does not mention the VOC emissions of coatings under the construction viscosity. Another point is the sag resistance of the coating film under the construction viscosity, and the dry film can only reach 50um without sagging, and these two points are exactly the problems existing in the high solid content acrylic polyurethane coatings on the market: (1) High solid content Due to the high viscosity of the paint system, a large amount of solvent must be added during use, which reduces the solid content of the construction and virtually increases the VOC emission per unit area of the paint, which exceeds the emission standards stipulated in the painting process. (2) The workability is poor, and the film formation is relatively thick at one time, resulting in serious sagging, and multiple sprayings are required to achieve the designed film thickness.

Contents of the invention

The purpose of the present invention is to optimize the high-solid and low-viscosity hydroxyacrylic resin, using raw materials such as deflocculation dispersant, anti-sag additive, high weather resistance pigment, spherical glass microspheres, solvent and active diluent, and advanced coating According to the preparation process, component A of high-solid aliphatic acrylic polyurethane coating is obtained, and component B of aliphatic isocyanate curing agent with low viscosity and high reactivity forms a two-component high-solid acrylic polyurethane coating. Compared with similar foreign products, the price is low and the construction is good. The invention solves the current technical problems of high-solid aliphatic acrylic polyurethane coatings such as high viscosity, low construction solid content, easy sagging during construction, and poor mechanical properties.

The purpose of the present invention is achieved through the following technical solutions.

A high-solid aliphatic acrylic polyurethane coating, the coating includes A, B, and C three-component raw materials mixed in a ratio of parts by weight A: B: C = 10: 1.5: 1.5-1:

Component A:

Component B:

100 parts of aliphatic isocyanate trimer;

Component C:

50-70 parts of butyl acetate;

30-40 copies of PMA;

S-100 10-30 parts.

Further, the high-solid low-viscosity hydroxyl acrylic resin is a product of France Akema Co., Ltd. At least one of 854BA80 or 73006D of Taiwan Changxing Chemical Co., Ltd. The resin has high solid content (80%), low viscosity (6000-7500mpa.s/25°C), narrow molecular weight distribution, low hydroxyl value and regular distribution of hydroxyl groups.

Further, the dispersant is at least one of BYK110 from German BYK Chemical Company or Disponer 9250 from American Hemings Co., Ltd.

Further, the wetting agent is at least one of BYKP104S of German BYK Chemical Company or EFKA5065 of BASF Company.

Further, the ultraviolet absorber is BASF 292 light stabilizer or at least one of Eversorb85 light stabilizer from Taiwan Yongguang Chemical.

Further, the spherical glass microspheres are at least one of spherical glass microspheres S38HS from 3M Company of the United States or F200 from Zhengzhou Shenglaite Hollow Microspheres Co., Ltd. Spherical glass microspheres have low oil absorption value, good ductility, and have a good cushioning effect when impacted by external forces.

Further, the leveling agent is at least one of BYK390 from German BYK Chemical Co., Ltd. or Disponer 495 from American Hemings Co., Ltd.

Further, the defoaming agent is at least one of BYK054 from German BYK Chemical Company or Tech-431 from Shanghai Tigermed Company.

Further, the aliphatic isocyanate trimer is at least one of HT-100 produced by Yantai Wanhua Company or TPA-100 produced by Asahi Kasei. The curing agent is 100% solids and low viscosity.

Correspondingly, the present invention also provides a kind of high solid content aliphatic acrylic polyurethane coating preparation method, comprises the following steps:

(1) Preparation of component A:

1) Preparation of 20% polyamide wax additive: mix 20 parts by weight of polyamide wax with 50 parts of high-solid and low-viscosity hydroxyl acrylic resin and disperse at 1500r/min until it becomes transparent pre-gel. When the temperature is below 20um, add 30 parts of butyl acetate at a low speed, stir evenly, and set aside;

Wherein, the polyamide wax adopts at least one of PA3X-20 polyamide wax produced by Clayville Company in France or JSP-1068 polyamide wax produced by Phoebe Company in Japan. This variety has good anti-sagging properties and does not thicken.

2) Preparation of grinding paste: Measure 50-70 parts of hydroxyacrylic resin into the tank, add 0.5-1.0 parts of wetting agent, 0.8-1.2 parts of dispersing agent, and 1-3 parts of triethyl ether in sequence under stirring at 500r/min Ethyl oxypropionate, 25-30 parts of rutile titanium dioxide, 10-15 parts of spherical glass microspheres, 0.2-0.4 parts of carbon black, 0.2-1.4 parts of 154L yellow, 0.3-0.8 parts of bentonite, 1-4 parts Xylene, disperse for 10-15min under 2000r/min stirring; the temperature is lower than 60℃ and the fineness is controlled to reach 20μm by grinding;

3) Paint mixing: grind the color paste into the tank, add 0.2-1 parts of ultraviolet absorber, 10-20 parts of 20% polyamide wax additives, 0.3-1 parts of leveling agent, 0.1-0.6 parts in sequence under stirring at 1500r/min 1 part of defoamer, 1-3 parts of butyl acetate to adjust the viscosity, stir for 10-15min, control the viscosity at 95-105KU Stormer viscosity, filter and pack to obtain component A;

(2) Preparation of component B:

Filter the trimer of HT-100 aliphatic isocyanate and pack it separately to obtain component B;

(3) Preparation of component C:

Mix butyl acetate:PMA:S-100=(50~70):(30~40):(10~30) according to the weight ratio, stir at 300r/min for 5min, pack, and obtain component C;

3) Mixing of components A, B and C:

When using, mix component A:component B:component C=10:1.5:1.5-1 by weight, stir evenly, and ripen for 15 minutes.

Compared with similar products on the market, the coating of the present invention has the following advantages:

(1) Low VOC content. High solid content coatings can effectively reduce the use of solvents in coating production.

(2) High solid content under construction viscosity. Spherical glass beads are used to increase the solid content of construction and reduce VOC emissions during construction.

(3) Environmental protection and energy saving. Using 80% solid-containing hydroxyl acrylic resin, the amount of solvent used in the production and coating process of the product is less, the construction solid content is high, and the construction VOC emission is below 340g/L (far lower than the national limit standard of 420g/L), which greatly reduces toxicity. Harmful gas emissions, so as to achieve energy saving and consumption reduction. And by reducing the use of solvents, the effect of energy saving and consumption reduction can be achieved.

(4) The coating cycle is short and the efficiency is high. The dry film thickness of one coating reaches 130um, and the coating film thickness of one application is 2-3 times higher than that of ordinary coatings, which reduces the number of coatings, improves coating efficiency and reduces labor intensity.

(5) The use of spherical glass beads greatly improves the impact resistance of the coating film. When the thickness of the coating film is 80-90um, the impact strength can reach 50kg·cm.

The high-solid aliphatic acrylic polyurethane coating of the present invention is a high-solid and low-viscosity product, with high solid content during construction, less VOC emissions per unit area, and good construction performance. The wet film can reach 200-250um in one spray without sagging, and the dry film thickness is between 200-250um. 130-140um, one-time coating and film formation, which greatly shortens the coating cycle and improves work efficiency. When the construction viscosity is reached, the VOC emission is 340g/L (far lower than the national limit standard of 420g/L). It has outstanding advantages such as good decoration, excellent mechanical properties, and high weather resistance. It has been widely used in various large machinery and bridges. Applications.

Detailed ways

The following descriptions are the preferred implementations of the present invention, and the protection of the present invention is not limited to the following preferred implementations, and the described examples are explanations rather than limitations of the present invention. At the same time, it is pointed out that for those skilled in the art, some modifications and improvements made on the basis of the inventive concept all belong to the protection scope of the present invention.

Example 1

Component A:

1) Preparation of 20% polyamide wax additives: 20 parts by weight of PA3X-20 polyamide wax from French Clayville Company and 50 parts by weight of French Akema Company After mixing 854BA80 high-solid and low-viscosity hydroxyl acrylic resin, disperse at 1500r/min until it becomes a transparent pre-gel, and the fineness is below 20um. Add 30 parts of butyl acetate under low-speed dispersion, stir evenly, and set aside.

2) Proportioning by weight, 70 parts 854BA80 high-solid and low-viscosity hydroxyl acrylic resin is metered into the tank, and 0.8 parts of BYK110 from BYK Chemical Company, 0.5 parts of BYKP104S from BYK Chemical Company, 1 part of ethyl triethoxy propionate, 25 parts are added at a speed of 500 r/min. 1 part of rutile titanium dioxide, 10 parts of spherical glass microspheres, 0.2 part of carbon black, 0.2 part of 154L yellow, 0.5 part of bentonite, 2 parts of xylene. In the next grinding process, pass through the grinder quickly in the first pass, control the fineness in the second and third passes, and control the grinding temperature below 60°C until the fineness reaches 20um. Transfer to the next process - paint mixing.

3) Letting: measure the ground color paste into the tank, and add 0.2 parts of BASF in sequence under stirring at 1500r/min 292 light stabilizers, 10 parts of 20% polyamide wax additives, 0.3 parts of BYK390 leveling agent of German BYK Chemical Company, 0.3 parts of BYK054 defoamer of German BYK Chemical Company, 3 parts of butyl acetate to adjust viscosity, stirring 15min, control the viscosity at 95-105KU Stormer viscosity. Filter, pack. That is, component A.

Component B:

Filter the aliphatic isocyanate trimer HT-100 trimer and pack it separately to obtain component B.

(3) Component C:

Mix butyl acetate:PMA:S-100=60:30:10 in parts by weight, stir at 300r/min for 5min, pack, and obtain component C.

When using, mix component A: component B: component C = 10: 1.5: 1 by weight, stir evenly, and ripen for 15 minutes before use. It can be applied by airless spraying, roller coating and brush coating.

A kind of high solid content aliphatic acrylic polyurethane coating product mechanical performance construction performance and VOC content test steps of the present invention are as follows:

Experimental equipment and materials:

Experimental equipment: salt spray resistance testing machine (Shanghai Linpin Instrument Equipment Co., Ltd.); GY-2 type press-in dry sandblasting machine (Beijing Changkong Sandblasting Equipment Co., Ltd.); adhesion tester (UK Elcometer) ; Sag tester (QAG-type paint sag tester, Tianjin Yonglida Material Testing Machine Co., Ltd.).

Substrate: 150×100×2mm steel plate

Surface treatment: ISO 8501 rated.

test system

Test sample preparation: After the steel plate is sandblasted, coat a layer of epoxy intermediate paint (Shaanxi Baotashan Paint Co., Ltd.), the dry film thickness is 140-150um, and the interval is 24 hours. Spray the product of the present invention, and the dry film is between 90-100um 7 days at room temperature for artificial accelerated aging resistance and salt spray resistance tests.

The main performance index test results of high solid aliphatic acrylic polyurethane coating (light gray) are shown in Table 1:

Table 1. Test results of VOCs, construction performance and anti-corrosion performance of high solid aliphatic acrylic polyurethane coatings.

Example 2

Component A:

1) Preparation of 20% polyamide wax additive: 20 parts by weight of JSP-1068 polyamide wax from Japan Phoebe Company and 50 parts by weight of 73006D (80%) high-solid and low-viscosity hydroxyl acrylic resin from Taiwan Changxing Chemical Co., Ltd. After mixing, disperse at 1500r/min until it becomes a transparent pre-gel, and the fineness is detected to be below 20um. Add 30 parts of butyl acetate at a low speed, stir evenly, and set aside.

2) According to the proportion by weight, 50 parts of 73006D (80%) high-solid and low-viscosity hydroxyl acrylic resin are metered into the tank, and 1.2 parts of Disponer9250 of Hemings Co., Ltd. of the United States and 0.5 part of BASF Corporation are added at a speed of 500r/min. EFKA5065, 2 parts of ethyl triethoxy propionate, 28 parts of rutile titanium dioxide, 15 parts of spherical glass microspheres, 0.3 parts of carbon black, 0.8 parts of 154L yellow, 0.3 parts of bentonite, 4 parts of xylene, after stirring evenly , adjust the rotation speed to 2000r/min and disperse for 10-15min, transfer to the next grinding process, pass through the grinder quickly in the first pass, control the fineness in the second and third passes, and control the grinding temperature below 60°C until fine The degree reaches 20um. Transfer to the next process - paint mixing.

3) Paint mixing: the ground color paste is metered into the tank, and 1 part of Taiwan Yongguang Chemical Eversorb85 light stabilizer, 20 parts of 20% polyamide wax additives, and 0.6 parts of Disponer 495 from Hemings Co., Ltd. of the United States are sequentially added under 1500r/min stirring. Leveling agent, 0.6 parts of Tech-431 defoamer from Shanghai Tigermed, 1 part of butyl acetate to adjust the viscosity, stir for 10 minutes, and control the viscosity at 95-105KU Stormer viscosity. Filter, pack. That is, component A.

Component B:

Take the Asahi Kasei aliphatic isocyanate trimer TPA-100 trimer, filter it, and pack it separately to get component B.

(3) Component C:

Mix butyl acetate:PMA:S-100=70:30:20 in parts by weight, stir at 300r/min for 5min, pack, and obtain component C.

When using, mix component A:component B:component C=10:1.5:1.5 in parts by weight, stir evenly, and ripen for 15 minutes before use. It can be applied by airless spraying, roller coating and brush coating.

The test steps of the mechanical performance, construction performance and VOC content of the high-solid aliphatic acrylic polyurethane coating product of the present invention are as follows:

Experimental equipment and materials:

Experimental equipment: salt spray resistance testing machine (Shanghai Linpin Instrument Equipment Co., Ltd.); GY-2 type press-in dry sandblasting machine (Beijing Changkong Sandblasting Equipment Co., Ltd.); adhesion tester (UK Elcometer) ; Sag tester (QAG-type paint sag tester, Tianjin Yonglida Material Testing Machine Co., Ltd.).

Substrate: 150×100×2mm steel plate

Surface treatment: ISO 8501 rated.

test system

Test sample preparation: After the steel plate is sandblasted, coat a layer of epoxy intermediate paint (Shaanxi Baotashan Paint Co., Ltd.), the dry film thickness is 140-150um, and the interval is 24 hours. Spray the product of the present invention, and the dry film is between 90-100um 7 days at room temperature for artificial accelerated aging resistance and salt spray resistance tests.

The main performance index test results of high solid aliphatic acrylic polyurethane coating (light gray) are shown in Table 1:

Table 1. Test results of VOCs, construction performance and anti-corrosion performance of high solid aliphatic acrylic polyurethane coatings.

Example 3

Component A:

1) Preparation of 20% polyamide wax additive: 20 parts by weight of JSP-1068 polyamide wax from Japan Phoebe Company and 50 parts by weight of 73006D (80%) high-solid and low-viscosity hydroxyl acrylic resin from Taiwan Changxing Chemical Co., Ltd. After mixing, disperse at 1500r/min until it becomes a transparent pre-gel, and the fineness is detected to be below 20um. Add 30 parts of butyl acetate at a low speed, stir evenly, and set aside.

2) According to the proportion by weight, 60 parts of 73006D (80%) high-solid and low-viscosity hydroxyl acrylic resin are metered into the tank, and 1.0 parts of Disponer9250 of Hemings Co., Ltd. of the United States and 1.0 parts of BASF Corporation are added at a speed of 500r/min. EFKA5065, 3 parts of ethyl triethoxypropionate, 30 parts of rutile titanium dioxide, 12 parts of spherical glass microspheres, 0.4 parts of carbon black, 1.4 parts of 154L yellow, 0.8 parts of bentonite, 1 part of xylene, after stirring evenly , adjust the rotation speed to 2000r/min and disperse for 10-15min, transfer to the next grinding process, pass through the grinder quickly in the first pass, control the fineness in the second and third passes, and control the grinding temperature below 60°C until fine The degree reaches 20um. Transfer to the next process - paint mixing.

3) Paint mixing: the ground color paste is metered into the tank, and 0.8 parts of Taiwan Yongguang Chemical Eversorb85 light stabilizer, 15 parts of 20% polyamide wax additives, and 1 part of Disponer495 from Hemings Co., Ltd. of the United States are sequentially added under stirring at 1500r/min Leveling agent, 0.1 part of Tech-431 defoamer from Shanghai Tigermed, 2 parts of butyl acetate to adjust the viscosity, stir for 15 minutes, and control the viscosity at 95-105KU Stormer viscosity. Filter, pack. That is, component A.

Component B:

Take the Asahi Kasei aliphatic isocyanate trimer TPA-100 trimer, filter it, and pack it separately to get component B.

(3) Component C:

Mix butyl acetate:PMA:S-100=50:40:10 in parts by weight, stir at 300r/min for 5min, pack, and obtain component C.

When using, mix component A:component B:component C=10:1.5:1.5 in parts by weight, stir evenly, and ripen for 15 minutes before use. It can be applied by airless spraying, roller coating and brush coating.

The test steps of the mechanical performance, construction performance and VOC content of the high-solid aliphatic acrylic polyurethane coating product of the present invention are as follows:

Experimental equipment and materials:

Experimental equipment: salt spray resistance testing machine (Shanghai Linpin Instrument Equipment Co., Ltd.); GY-2 type press-in dry sandblasting machine (Beijing Changkong Sandblasting Equipment Co., Ltd.); adhesion tester (UK Elcometer) ; Sag tester (QAG-type paint sag tester, Tianjin Yonglida Material Testing Machine Co., Ltd.).

Substrate: 150×100×2mm steel plate

Surface treatment: ISO 8501 rated.

test system

Test sample preparation: After the steel plate is sandblasted, coat a layer of epoxy intermediate paint (Shaanxi Baotashan Paint Co., Ltd.), the dry film thickness is 140-150um, and the interval is 24 hours. Spray the product of the present invention, and the dry film is between 90-100um 7 days at room temperature for artificial accelerated aging resistance and salt spray resistance tests.

The main performance index test results of high solid aliphatic acrylic polyurethane coating (light gray) are shown in Table 1:

Table 1. Test results of VOCs, construction performance and anti-corrosion performance of high solid aliphatic acrylic polyurethane coatings.

result:

1. The construction solid content of the product of the present invention reaches 64.5%, while the construction solid content of the same type of product is only 40%, which is 24.5% higher.

2. The product of the present invention has good workability, and the dry film thickness of one-time film formation reaches 140um without sagging. The dry film of the same type of product can only achieve 80um. Reduce the number of coatings, reduce labor intensity, and shorten the coating cycle.

3. The construction VOC is 340g/L, (far lower than the national limit standard of 420g/L), which greatly reduces the emission of toxic and harmful gases, and is an environmentally friendly product in the field of heavy-duty anti-corrosion products.

4. Good mechanical properties, impact resistance.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (7)

1. A high-solid aliphatic acrylic polyurethane paint is characterized in that the paint comprises A, B, and C three components mixed by weight A: B: C=10: 1.5: 1.5～1 ratio of raw materials: Component A: Component B: 100 parts of aliphatic isocyanate trimer; Component C: 50-70 parts of butyl acetate; 30-40 copies of PMA; S-100 10~30 copies; The high-solid low-viscosity hydroxyl acrylic resin is produced by France Akema Co., Ltd. At least one of 854BA80 and 73006D of Taiwan Changxing Chemical Co., Ltd.; the resin has a solid content of 80%, a viscosity of 6000-7500mPa.s/25°C, a narrow molecular weight distribution, a low hydroxyl value, and a regular distribution of hydroxyl groups; The spherical glass microspheres are at least one of the spherical glass microspheres S38HS of the U.S. 3M Company and the F200 of Zhengzhou Shenglaite Hollow Microsphere Co., Ltd.; The aliphatic isocyanate trimer is at least one of Yantai Wanhua Company's HT-100 and Asahi Kasei's TPA-100; The wet film of the paint can reach 200-250 μm without sagging in one spraying, and the thickness of the dry film is 130-140 μm, and the film is formed in one coating. 2. a kind of high solid aliphatic acrylic polyurethane coating as claimed in claim 1, is characterized in that, described dispersant is at least one in the BYK110 of German Byk Chemical Company, the Disponer9250 of U.S. Hemings Co., Ltd. . 3. A kind of high-solid aliphatic acrylic polyurethane coating as claimed in claim 1, is characterized in that, described wetting agent is at least one in BYKP104S of German BYK chemical company, BASF company EFKA5065. 4. a kind of high solid aliphatic acrylic polyurethane coating as claimed in claim 1, is characterized in that, described ultraviolet absorber is BASF 292 light stabilizer, at least one of Taiwan Yongguang Chemical Eversorb85 light stabilizer. 5. A kind of high-solid aliphatic acrylic polyurethane coating as claimed in claim 1, is characterized in that, described leveling agent is at least one in the BYK390 of German Byk Chemical Company, the Disponer495 of U.S. Hemings Co., Ltd. kind. 6. A kind of high-solid aliphatic acrylic polyurethane coating as claimed in claim 1, is characterized in that, described defoamer is at least one in the BYK054 of German BYK chemical company, the Tech-431 of Shanghai tiger company kind. 7. a preparation method of high solid aliphatic acrylic polyurethane coating according to claim 1, is characterized in that, comprises the steps: (1) Preparation of component A: 1) Preparation of 20wt% polyamide wax auxiliary agent: mix 20 parts by weight of polyamide wax with 50 parts of high-solid and low-viscosity hydroxyl acrylic resin and disperse at 1500r/min until it becomes a transparent pre-gel. When the temperature is below 20um, add 30 parts of butyl acetate at a low speed, stir evenly, and set aside; 2) Preparation of grinding paste: Measure 50-70 parts of high-solid and low-viscosity hydroxyacrylic resin into the tank, add 0.5-1.0 parts of wetting agent, 0.8-1.2 parts of dispersing agent, 1-3 25-30 parts of triethoxy ethyl propionate, 25-30 parts of rutile titanium dioxide, 10-15 parts of spherical glass microspheres, 0.2-0.4 parts of carbon black, 0.2-1.4 parts of 154L yellow, 0.3-0.8 parts of bentonite, 1-4 parts of xylene, disperse for 10-15 minutes under stirring at 2000r/min; the temperature is lower than 60°C and the fineness is controlled to reach 20μm by grinding; 3) Letting: Grind the color paste into the tank, add 0.2 to 1 part of UV absorber, 10 to 20 parts of 20wt% polyamide wax additive, 0.3 to 1 part of leveling agent, 0.1 to 0.6 1 part of defoamer, 1-3 parts of butyl acetate to adjust the viscosity, stir for 10-15min, control the viscosity at 95-105KU Stormer viscosity, filter and pack to obtain component A; (2) Preparation of component B: Filter the trimer of HT-100 aliphatic isocyanate and pack it separately to obtain component B; (3) Preparation of component C: Mix butyl acetate: PMA: S-100 = (50-70): (30-40): (10-30) in parts by weight, stir at 300 r/min for 5 minutes, pack, and obtain component C; (4) Mixing of component A, component B and component C: When using, mix component A:component B:component C=10:1.5:1.5-1 by weight, stir evenly, and ripen for 15 minutes.